The SYN Level-1 processing control parameter file contains all parameters necessary to control Level-1 processing, including:

the OLCI and SLSTR reference bands

switches allowing a choice of the SLSTR Level-1B SWIR sub-bands (A, B or TDI) to be processed at Level-1C and applicable to the two SLSTR views

a switch to choose the method for selecting the GCPs in the processed image (from a database, with steps given, with the number of GCPs given or from an external file) and the dedicated parameters for creating the GCP database

several parameters and thresholds used in GCP rejection tests and several switches enabling computation of the different tests